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        <h1 class="title">《图解http》读书笔记</h1>
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            <ol class="post-toc"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#TCP-IP-的分层管理"><span class="post-toc-number">1.</span> <span class="post-toc-text">TCP/IP 的分层管理</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#发送端与接收端的数据传输"><span class="post-toc-number">2.</span> <span class="post-toc-text">发送端与接收端的数据传输</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#TCP三次握手"><span class="post-toc-number">3.</span> <span class="post-toc-text">TCP三次握手</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#各个协议与http协议"><span class="post-toc-number">4.</span> <span class="post-toc-text">各个协议与http协议</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#URI和URL的区别"><span class="post-toc-number">5.</span> <span class="post-toc-text">URI和URL的区别</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#GET与POST"><span class="post-toc-number">6.</span> <span class="post-toc-text">GET与POST</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#HTTP支持的方法"><span class="post-toc-number">7.</span> <span class="post-toc-text">HTTP支持的方法</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#状态码类别"><span class="post-toc-number">8.</span> <span class="post-toc-text">状态码类别</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#HTTPS"><span class="post-toc-number">9.</span> <span class="post-toc-text">HTTPS</span></a></li></ol>
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        <h1 class="post-card-title">《图解http》读书笔记</h1>
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            <time class="post-time" title="2018-03-16 17:34:10" datetime="2018-03-16T09:34:10.000Z"  itemprop="datePublished">2018-03-16</time>

            
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<p>最近花了点时间看了上野 宣的《图解http》,收获良多。本书浅显易懂，小白也能看懂。</p>
<p>我把看书过程中感兴趣的做了一些笔记。</p>
<a id="more"></a>
<h4 id="TCP-IP-的分层管理"><a href="#TCP-IP-的分层管理" class="headerlink" title="TCP/IP 的分层管理"></a>TCP/IP 的分层管理</h4><p>4层：应用层/传输层/网络层/数据链路层</p>
<p>好处：如果互联网只由一个协议统筹，某个地方需要改变设计时，就必须把所有部分整体替换掉。</p>
<p>但如果分层了，只需要把变动的层替换即可。</p>
<blockquote>
<p>层次化之后，设计也变得相对简单了。处于应用层上<br>的应用可以只考虑分派给自己的任务，而不需要弄清对方在地球上哪<br>个地方、对方的传输路线是怎样的、是否能确保传输送达等问题</p>
</blockquote>
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                <div class="image-caption">四层协议</div>
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<h4 id="发送端与接收端的数据传输"><a href="#发送端与接收端的数据传输" class="headerlink" title="发送端与接收端的数据传输"></a>发送端与接收端的数据传输</h4><figure class="image-bubble">
                <div class="img-lightbox">
                    <div class="overlay"></div>
                    <img src="https://s2.ax1x.com/2019/01/17/kp3gCF.png" alt="数据传输" title>
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                <div class="image-caption">数据传输</div>
            </figure>
<p>说明：发送端层与层之间传输数据时，每经过一层会被打上该层所属的首部的信息。而再接收端层与层传输数据时，每经过一层，会把对应的首部去掉。</p>
<h4 id="TCP三次握手"><a href="#TCP三次握手" class="headerlink" title="TCP三次握手"></a>TCP三次握手</h4><p>握手的过程中使用了TCP的标志：SYN（synchronize） 和ACK（acknowledgement）。</p>
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                <div class="image-caption">三次握手</div>
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<h4 id="各个协议与http协议"><a href="#各个协议与http协议" class="headerlink" title="各个协议与http协议"></a>各个协议与http协议</h4><p>下图详细介绍了IP协议，TCP协议和DNS服务在使用HTTP协议的通信过程中发挥的作用。</p>
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<h4 id="URI和URL的区别"><a href="#URI和URL的区别" class="headerlink" title="URI和URL的区别"></a>URI和URL的区别</h4><p>URI：统一资源标识符</p>
<p>URL：统一资源定位符，就是访问web页面在浏览器上输入的网址。</p>
<p>至于区别，知乎上有人形象比喻：</p>
<blockquote>
<p>统一资源标志符URI就是在某一规则下能把一个资源独一无二地标识出来。<br>拿人做例子，假设这个世界上所有人的名字都不能重复，那么名字就是URI的一个实例，通过名字这个字符串就可以标识出唯一的一个人。<br>现实当中名字当然是会重复的，所以身份证号才是URI，通过身份证号能让我们能且仅能确定一个人</p>
</blockquote>
<p>上面是URI，看看下面的URL:</p>
<blockquote>
<p>那统一资源定位符URL是什么呢。也拿人做例子然后跟HTTP的URL做类比，就可以有：动物住址协议://地球/中国/浙江省/杭州市/西湖区/某大学/14号宿舍楼/525号寝/张三.人可以看到，这个字符串同样标识出了唯一的一个人，起到了URI的作用，所以URL是URI的子集。URL是以描述人的位置来唯一确定一个人的。</p>
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<p>URI用字符串标识某一互联网资源，而URL表示资源的地点。可以说，URL是URI的子集。</p>
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                <div class="image-caption">URI格式</div>
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<h4 id="GET与POST"><a href="#GET与POST" class="headerlink" title="GET与POST"></a>GET与POST</h4><p>GET：获取资源</p>
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                    <img src="https://s2.ax1x.com/2019/01/17/kp3234.png" alt="get" title>
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                <div class="image-caption">get</div>
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<p>POST：传输实体主体</p>
<p>POST的主要目的并不是获取响应的主体内容。</p>
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                    <img src="https://s2.ax1x.com/2019/01/17/kp3TUK.png" alt="post" title>
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                <div class="image-caption">post</div>
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<h4 id="HTTP支持的方法"><a href="#HTTP支持的方法" class="headerlink" title="HTTP支持的方法"></a>HTTP支持的方法</h4><figure class="image-bubble">
                <div class="img-lightbox">
                    <div class="overlay"></div>
                    <img src="https://s2.ax1x.com/2019/01/17/kp35Hx.png" alt="get等" title>
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                <div class="image-caption">get等</div>
            </figure>
<p>如上图，我们一般只用前5个方法。</p>
<h4 id="状态码类别"><a href="#状态码类别" class="headerlink" title="状态码类别"></a>状态码类别</h4><figure class="image-bubble">
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                    <div class="overlay"></div>
                    <img src="https://s2.ax1x.com/2019/01/17/kp364U.png" alt="状态码类别" title>
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                <div class="image-caption">状态码类别</div>
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<h4 id="HTTPS"><a href="#HTTPS" class="headerlink" title="HTTPS"></a>HTTPS</h4><p>为了保证服务器与客户端信息传递的安全性，需要在HTTP上再加入<strong>加密处理</strong>和<strong>认证等机制</strong>。添加了这种机制的HTTP称为HTTPS(HTTP Secure)。</p>
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                <div class="image-caption">HTTPS</div>
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<p>除了上面的知识，书中还介绍了一些注入攻击的内容，不过有些技术可能现在已经派不上用场。也就不记录下来了</p>

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